Roy Keane was dumbfounded by David Beckham's fancy purchase at Man United

Netflix has taken a deep dive into the Red Devils and England legend's rise to fame in a new series named 'Beckham'.

One man that witnessed Beckham rise to become an international superstar alongside his wife, Spice Girl Victoria Beckham, was Keane.

The pair played with each other for 10 years between 1993 and 2003 before Becks left for Real Madrid.

But as much as Keane loves his former teammate that he won six Premier League titles, two FA Cups and one Champions League with, one moment during their time at Old Trafford left the Irishman completely baffled.

"That and his Porsche," said Keane when asked about Beckham's car collection on the Netflix show. "He was the first to kinda... saying that, he upped everyone's game in the car park I'll give him that.

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"He came in and he was like 'I've just bought a fancy pen,' and we were like 'Who the f*** buys a pen? Who buys an expensive pen?

"Shirts and clothes I get all that and cars, but who buys a pen?"

As well as being an extremely talented footballer, Beckham was known for his fashion and lavish lifestyle.

One of his first sponsorship deals was with Adidas and the ex-England captain revealed just how he spent the entirety of his first bonus in the documentary, too.

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"That season was the start for me of working with the brands, that was the first time I stepped outside of football. Not many footballers were doing that at that point. But yeah I got paid," he told Netflix.

"I spent my money, I liked nice stuff. As soon as we got money I was like 'I want to buy a nice watch'. I signed a contract with Adidas for £50,000 and I went and bought an [BMW] M3 for £50,000."

Forget the BMW, Becks, we want to know how much that pen cost...